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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caf470edc29464dad3e67818b87a2af3353a20b15b2ac99cfdf16d228664bdb' 
  AND token = 'Z/A91U4cp5LiNemVTN0MJthqt71f0Jv6AFTiaIEDw3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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