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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cceabb57ffe70c631117cab280c6cf3c80ef2665a0e0c86c610bd8c5d9fc81' 
  AND token = '+CZid+n1NpXxy/c6r3NBlkq9BAsAUFfq4XwR0pibv38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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