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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b91a278b8236532855f6e95aaed4aa27aaa38253f6fe0959cc5373f035ea69' 
  AND token = 'XL7oMfKCdcmwkQsvI7+R7Z9UIysFUtG/TY5rHBdO7DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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