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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9249886ed62fd6476d03df06fd85089207cc68ce0cef59e404b1fe9406a488ff' 
  AND token = 'aiBuoiFyWhw4XwnbgrOHSkQ8iCjB2qGn7HuJ1UhiMoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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