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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8b85966986bb9b3031903b0a089d356307171e31fc7a0381b1a12e2d2ab5ef' 
  AND token = 'z5RNildfFLYwYf49UrNSQHQYv1ULMS4dOGKagS7OuPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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