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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c472678b780b120145218de8b600a780ecfdc2deff8d0cf0ced30d467158e2ad' 
  AND token = '4H2sk9Hul7UOIgWd2iT0l+n9iAq2T9yaeZk60vaQhOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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