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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938c8a1bd3d236ce90ac84a4ce94ebe07953de2e851f42cea50139a7868ab470' 
  AND token = 'x4HHLfNd7yWzzHSAMIE8wTI4US4nhPu4bb3W89KfwpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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