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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824f464081911ceb2fb8d77c9e9f5aee1c4ce13aa754ad075a7b4983f92b6db3' 
  AND token = 'xbj065dKNBkQLKdoGu7fxD/DvNyk3gIkq5cueBXN+yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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