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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad43726cba915a8965b5d348eba55e1599c3e85e87fb28492e173c482ff0bb6' 
  AND token = 'fbuLhAODG9b31+GsJ+Xwe+w3x/Bxa8VvJo3hMxNphE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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