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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828a680151a19f692adc6de61b027394e81e55137b949fa1d52865907b89bd7d' 
  AND token = '3GfpMWBCuNmVxMa6AepLGzWPTPmRWVKQKJr2DYaOXV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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