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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28e4b7faefdf059d82576f72f7e7508ba0dbb45b28e8d47794a40a7bd5c806d' 
  AND token = 'FoSugmLrd3xNSSIqzdhe35fFxRzztInudVSnp/JakMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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