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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ebe71f04d04d74e9f665deedbde821a9b82ab0d01c17e0f31d40ddda6bc197' 
  AND token = 'QOwO3iOHdj3nSh2QQTIVlqE2yprKixkXy4GWUHQBWq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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