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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4353ce007c31af2cd494b2794aa6bf6a4c57d2c3c75cbc2693029e73d30856c' 
  AND token = 'enMtDnw0VBmqr/6EtH9of50ez5lw9o0jCGyKn6/srtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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