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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1003b8ee087819cea879b01014e569f6da029985b4e99aba9d65639e97a4609c' 
  AND token = 'KLJi4smq7/t+yITfuvtPtLXXcsVCBcEghW0KmGdake8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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