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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a39e7c6692feeaeed0e3c9ce474ffece99b29a8ae46b592a7a304790b79711e' 
  AND token = 'u9SyxqYqZBNlNbJTOjbl7HuOhU2lzpqNWg5tO3YIY3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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