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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05322036fb971dc0f329f5772449934c1f72fc397cc297f1b8898f1790b23e7' 
  AND token = 'Zvy14ghsSgjs17hQnhwsDbA7YvBvGTA1vsp7sTIWtBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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