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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d2788a746c6b201515889f1014991ae50c809499ff0440fd043f7f1ac6c4ee' 
  AND token = 'ulMISHMGWLS4cuTjOLCK+hpDUEIr9Wg/BwUSI+26yGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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