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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7898eb124b9494a806f636459f5a18ec132f00ca8e34c859a7fd40f8337ea326' 
  AND token = '0ivkITd3m4Cyya+BiizoHkpln575ru1R1rTPlVLQjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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