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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8c1695717ba3157bca111f191c68df5b44b2cb4105b33af5a4274b6597cf39' 
  AND token = 'UNAJFqfTqPolfqSrmehqOh5NFsc6qUq3sQNRpe+0Erw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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