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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f4cd04a63d8641f084299e4954f5d7f52e40bb4cc5a686ee6d6aaac47d71a1' 
  AND token = 'VOGDUoC9wxrPH9pet7n8gueRtvxqUrThBB1wUkCOqwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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