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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75a60bc2bdc8dada0d852e3968fe42977900f517568cdf7ae5241e10915dae0' 
  AND token = '1QvehCjHhFpH3jfM7Be4brUswbfL7cdFn52Y7D+DK6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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