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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1b44c2af8576d56b390c96597aa22968b9c86c01d5ab19d8372c2eb576b908' 
  AND token = 'D1XCHqrrqCdFJrfnKJWtP2hawBZ9TmKrzvJPnnF3IH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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