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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb743701905bc4407819a7eb46873584bcf5094919bf7e067028ac40775246d' 
  AND token = 'yI2IuO6laDSscz6nudGnB2sBcWlzj/LWy6VZzI62evE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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