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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579677f51c07340961ecb94e572cd6c7c46546aa8f60ef9cf756420ce544af77' 
  AND token = '79NE0gAaFYE08Poi81ioS1dh/Pt6oVHj2tPEGG3UBZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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