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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb09acd44ade0fdd7ab484d6efcca8611b4f561caecafc7cec2ef1fd6eb9b03' 
  AND token = 'LfUVM2QW4YoCk9oLq5M9SGvlVatwgOrxW0bpbezLMWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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