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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593cd6bcf165f62bdab2649ea199dfa82446fea3788976bf5d3f1fa3611ef73e' 
  AND token = 'Y3ZG8eKlXj+UqzeMzQbkPBzEQs8uaLXpvaobNysl09k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}