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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2871b8745a1fd300e8db51f80b79d18474c2b5236820730c3ed7345d81f2e4c7' 
  AND token = 'Kvrp45P4vpQcvXrIBa7n5iTmAKaXjR+HkiIxsfgcZVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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