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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f77434e0f032ec6f3971a7a24b62d7b39e6d90f3637815b9af6c4a6aef3c16' 
  AND token = 'NsV24lw0XD00YTgb9ZX1C5eRY70kjE4J79/PNCN4GCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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