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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25fd1e00f1eae4a1b7fa5860d92a03f27cd1b5f15b59891dc580f444bce0299' 
  AND token = 'NNEI7Sv6isJPfx10mSXVxVac+V0QnkNX0vNV/2TP1+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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