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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd770b8ccbc53b4ace0d1c9c1f55f42dde4860b7c004bc8f71a29e5e82603f511' 
  AND token = '8fxA5B8IP4UlVx9yJZJyUNdVB8qOqyjJrRf0UOkMI7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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