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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f34167b0b7fa72bfd96218b92ff152fbdf6c114d9140ce049c2a8248f0ce356' 
  AND token = 'PpOq+jpiKbkh4SC4KA0+PU2M+LX3p3NfHSby7soKtys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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