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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baf30c0fcee887dea685233ca9aa0bffad8ebffa13f12ec3411d25946791ddd' 
  AND token = 'P1xb/pNF3k8BnhkND1OeY1D6/uiY7ZJdgymROjM2Efg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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