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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180e63109e917edcfd3c9cdc03db67e566a7ca2f39ec4f883922cab9c9bfc167' 
  AND token = 'RzA16/DringpoSQnJi0mhuLQdNfISnhMxu2xANPyFL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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