SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ebef9fd51d258ce67aa8cd265822132906ad8661e4a8eb0aea7f1295c2e78b' 
  AND token = 'ZSL2rP3c1K+qI7svhwxmJwhYJ/s8WouFF5jCj6YcakI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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