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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb046f19612d7730e294d8e1fdf554013ac931cf1e4cd07b8ecd14dcc1db769' 
  AND token = 'Vcot3184s38uglgHdNTxL2zpuj1O7yJA/lZpF23Y0hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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