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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f248303f655991e0742d99973f7eaf2805cb01dab16ec8c4e00ecf95461352' 
  AND token = '9NCbK7B0VMDPBuSYgQWEOXfnLa26ZE++s61V2pO6QQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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