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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a219559d1c4586d1c5c3c3397051adb0e9b6b72074907d4692afb1ea73aa89' 
  AND token = 'lD9+35Lhs0+lV4bxly0hU0lNHjam1zYfw+UxIJeVxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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