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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6cf696a449965e900a31ae81927b7cadec75576165c44a84b3932ef9bc49af' 
  AND token = 'cdRYOaejU7z+XtYWyFvputiuASx6ovxJhSaf8XA7tCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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