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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64edd71026a6d1b171579c9eea26678d3345346c16e8b323b69ddd86e3995ab' 
  AND token = 'j2IBdGf3jJMhDai3S7yDCb7c5ZOSf+REeEMBKhcWuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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