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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6d19d377de0f75cd56e04d6abfb9e574e5fe38bd2bf41c7ae715af511e651d' 
  AND token = 'MMezIJBiR/fajNEomTxkmhY4T5iWYcDKKpuZg20yk8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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