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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe3758315479857fae53c8773915a58a079f26266c6fb657c30c06744936697' 
  AND token = 'kkYyd0hSXl5lVz8bW8XQnA+XZVXdZej/ra7+7WGwJJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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