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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83d8cb77ca8ecd5b8bce0a25477cc9302b27422d86f491b0b72a6c6c4ce35e4' 
  AND token = 'QZe5IN6fUiITzUO534/zmxK1x6m6kQIYgNk4FH8SRIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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