SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768469883a1af0dde58253a22cbda8285532025696be3ac072bf3f5131634f2c' 
  AND token = 'ggOJluEmVReJAk6UjRLixXsGHRGUph4NlDB9mWnuVrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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