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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca7e690867b5e5ee47167890774767be2b9164b368781c326e87a1d13cb4931' 
  AND token = '9UdcD5FnGs3R6vKeZu47FcbJoOydHm1OzpHPWOn/U60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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