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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbab82bf8711c1206dd14b06490a22495c9599b011c615a4eeac94cc8f7adfec' 
  AND token = 'viYZQLuPf3Jc8Kf39L/+M0BjmUd1dU3zFQVM+xZP92I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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