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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626005fb7ae69c37fe0348a40a8ec8d026adc13cfb597bab5c791860bbf892be' 
  AND token = 'DGRINY6/zhNrexc6Pm4F9tk4OtQeGSBZz9hDbzV+ANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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