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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13075f57da16a6e0a8bb65e5dbd646fd32babefa5c6a90421a0c7e8d2dd7d0d2' 
  AND token = 'okjdblH7rXd9S41YDUn/dSZdHYxHHS4pQXjOIcWyDEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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