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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0823fdf60bc61afd725a1e3c9a9d70f2fdf7f2670506ab9cc3afba47accee1b4' 
  AND token = 'Lf28dSUTgIUoDyrG3b9q/e7GgmvlVeJoKrRZMad1B5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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