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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269fd09df3a16ba8242ae866a76c7834e3e5ab818a429a89842d2b11be23939c' 
  AND token = 'PKKK8sf2VxHB204oxg9WcFHMObZ1+eYNglE7LiOoBZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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