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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a28e1b68824f7eee7f15b6597ab7f90747100b3155a2189fbed362300bd0384' 
  AND token = 'JsJayWoIW9heF2vfSzzahX66V/LV+G8m8FxXmmmeC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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