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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b19583104cb85b6fa36db084456b370cdc9cf01a52cc50c86ccb5570bf495ea' 
  AND token = 'hcscQZ/d4TzuM9MPhi1uvMVN+X+sXeGs5IB7Dm3G2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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