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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ebee7129e95a292a1461ddf8849a181363bbef96fb7d78f689a8c08a7453c9' 
  AND token = 'qvspavBj5FsmzNc7k1YgapCHadb30ECjbZQWN9T6jkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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