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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eeee1e9799a2377b2646096c337577e5aa99986c9b83325ce3239d88340225f' 
  AND token = 'F2murd7iokt6hScc6O2Msuxy98qvTLeNt0GYwMht3E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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