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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7a140e598b19064129655d69c6b055d28e4d329a2f19fd05de4e9c0f540b06' 
  AND token = 'NZHcnWlO7/HEhAHlSUPHC7NInr0OHvx/8lWkXcyvs7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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