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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984afcd5c4ffbac7ef561afb7ea0489aba298b8cd34e897d14151533b66f55c7' 
  AND token = 'LZ3xdiF/0W15VRqEpJNux+h7+RUHnrGzVyesqX7bbRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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