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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a1a09d63aa126b5bc743be026ec597e3a2e54be9f5cb486edd57affa5f8e28' 
  AND token = 'SOg5wUjdnAZHxwguEYZphqNa3E5H4quTZ+3xP8zwC7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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