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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b98ba8cd8c93f4b5df2f38b351875d7ee4129015ee7e2ce927d73042da3af1b' 
  AND token = 'ZQJ47RGciTXxg6ymSKG0zptgMTuHUdWIuS51dV9RonQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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