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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8076272ba588b7cd67aade7f9d4bae8c29e9cc432231aa7ce1196d1adec5cba' 
  AND token = '3cst6WNLpWrY/UuAm0TlVxl/eTuYxbmUzk0UQEhFim0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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