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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f4f14d466c53c9bef84050616f7ea90ad0cbb25b4be13e44b8865f051c366c' 
  AND token = 'Yt4ygtTYyns9ka18UX9VXC0FhB8X+2ZUsQPIwShSC2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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