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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb4478326c7c520bb7e2d40cc593ef67d50b1b4b2fc2daf8fedb9fe12a840f6' 
  AND token = 'Bee5YYEcd+uZp/yEd2xXLxZlH7tO0kK05cOXpPjOrMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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