SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a42dd25764b3bae717a886d473574c25a1f38671f5e423b5a240c11782f925f' 
  AND token = 'xqOEDBXwJIgQIDeWGhjkC4Pn8epsnovw+sN1ggULSgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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