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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d9b0e9bf80cdbba8971dc5b6d2ca1c153661f8fcabd37b6516d026884eae9d' 
  AND token = 'ehgm8OPP9BGCEOCveWnMcoWdA2+BdMsdDLI7YHqjPSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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