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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df91c1e5468d3fee36df4a59e74bfb89692ab9de368e8ecbe88cb92aea3559a7' 
  AND token = 'Aj0Wyu2QgyAYyREGZnLM3mntuzvEwdZ2sUA7hJv0uh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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