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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29546ba06b06440563c2577e665b8ecab679c5b68088f34febd5f3974117959' 
  AND token = 'cD83qTl1gWVj1TMEFNUt0XNwT/LMD2QOo75hBrWhUHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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