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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f69f4a7e127ea9c94686d85d90f12c76ece4c771574ffd87fdb06854e946ad' 
  AND token = '2Gu/Oo50kEY2MOUMk3NFSZdbaf9T8s5TLyJgueXfpmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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